公开(公告)号：US20170338782A1

公开(公告)日：2017-11-23

申请号：US15660571

申请日：2017-07-26

Applicant: Luxtera, Inc.

Inventor： Brian Welch

IPC: H03F3/45 ,  H03F3/08 ,  G01J1/44 ,  H03F1/34

CPC classification number: H03F3/45237 ,  G01J1/44 ,  H03F1/34 ,  H03F3/087 ,  H03F3/45071 ,  H03F3/45076 ,  H03F3/45475 ,  H03F3/45968 ,  H03F2200/405 ,  H03F2203/45222 ,  H03F2203/45288 ,  H03F2203/45511 ,  H03F2203/45526

Abstract: A system for a differential trans-impedance amplifier circuit comprising: an amplifier having a pair of input nodes and configured to generate an amplified replica of a differential voltage on said pair of input nodes; a photodiode; a pair of DC-blocking capacitors coupling said photodiode to said pair of input nodes; at least one resistance coupled between said pair of input nodes of said amplifier; and a bias network comprising two identical photodiode biasing resistances each photodiode biasing resistance coupled in series between said photodiode and a respective DC voltage. A feedback loop for the amplifier may include source followers that are operable to level shift voltages prior to coupling capacitors that couple said photodiode to said amplifier to ensure stable bias conditions for said amplifier. The source followers may include CMOS transistors. The amplifier may be integrated in a complementary metal-oxide semiconductor (CMOS) chip, which may include a CMOS photonics chip.

公开(公告)号：US20170134192A1

公开(公告)日：2017-05-11

申请号：US15412352

申请日：2017-01-23

Applicant: Luxtera, Inc.

Inventor： Brian Welch

IPC: H04L25/06 ,  H04B10/69

CPC classification number: H04L25/061 ,  G02B6/4201 ,  G02B6/4242 ,  H04B10/501 ,  H04B10/516 ,  H04B10/564 ,  H04B10/60 ,  H04B10/693 ,  H04L25/0272

Abstract: Methods and systems for split voltage domain receiver circuits are disclosed and may include amplifying complementary received signals in a plurality of partial voltage domains. The signals may be combined into a single differential signal in a single voltage domain. Each of the partial voltage domains may be offset by a DC voltage from the other partial voltage domains. The sum of the partial domains may be equal to a supply voltage of the integrated circuit. The complementary signals may be received from a photodiode. The amplified received signals may be amplified via stacked common source amplifiers, common emitter amplifiers, or stacked inverters. The amplified received signals may be DC coupled prior to combining. The complementary received signals may be amplified and combined via cascode amplifiers. The voltage domains may be stacked, and may be controlled via feedback loops. The photodetector may be integrated in the integrated circuit.

公开(公告)号：US09548811B2

公开(公告)日：2017-01-17

申请号：US14196122

申请日：2014-03-04

Applicant: Luxtera, Inc.

Inventor： Daniel Kucharski ,  Brian Welch ,  Sherif Abdalla

IPC: G02B26/00 ,  G02F1/01 ,  H04B10/079 ,  G02F1/225 ,  H04B10/50 ,  H04B10/54 ,  G02B26/06 ,  G02F1/21 ,  G02B26/08

CPC classification number: H04B10/5161 ,  G02B26/06 ,  G02B26/0841 ,  G02F1/0121 ,  G02F1/225 ,  G02F1/2255 ,  G02F2001/212 ,  G02F2201/58 ,  H04B10/0795 ,  H04B10/505 ,  H04B10/5053 ,  H04B10/541

Abstract: Methods and systems for encoding multi-level pulse amplitude modulated signals using integrated optoelectronics are disclosed and may include generating a multi-level, amplitude-modulated optical signal utilizing an optical modulator driven by two or more of a plurality of electrical input signals. The optical modulator may configure levels in the multi-level amplitude modulated optical signal. Drivers may be coupled to the optical modulator, and the plurality of electrical input signals may be synchronized before being communicated to said drivers. Two or more of said plurality of electrical input signals may be selected utilizing one or more multiplexers. The one or more multiplexers may select an electrical input or a complement of the electrical input. Phase addition may be synchronized in a plurality of optical modulator elements in the optical modulator utilizing one or more electrical delay lines. The optical modulator may be integrated on a single substrate.

Abstract translation: 公开了使用集成光电子学来编码多级脉冲幅度调制信号的方法和系统，并且可以包括利用由多个电输入信号中的两个或多个驱动的光调制器来产生多电平调幅光信号。 光调制器可以配置多电平调幅光信号中的电平。 驱动器可以耦合到光调制器，并且多个电输入信号可以在被传送到所述驱动器之前被同步。 可以利用一个或多个多路复用器来选择所述多个电输入信号中的两个或更多个。 一个或多个多路复用器可以选择电输入或电输入的补码。 利用一个或多个电延迟线，相位相加可以在光调制器中的多个光调制器元件中同步。 光学调制器可以集成在单个基板上。

公开(公告)号：US09431977B2

公开(公告)日：2016-08-30

申请号：US14305733

申请日：2014-06-16

Applicant: Luxtera, Inc.

Inventor： Brian Welch

IPC: H03F3/45 ,  H03F1/34 ,  H03F3/08 ,  G01J1/44

CPC classification number: H03F3/45237 ,  G01J1/44 ,  H03F1/34 ,  H03F3/087 ,  H03F3/45071 ,  H03F3/45076 ,  H03F3/45475 ,  H03F3/45968 ,  H03F2200/405 ,  H03F2203/45222 ,  H03F2203/45288 ,  H03F2203/45511 ,  H03F2203/45526

Abstract: A system for a feedback amplifier with sub-40 khz low-frequency cutoff is disclosed and may include amplifying electrical signals received via coupling capacitors utilizing an amplifier having feedback paths comprising source followers and feedback resistors. Gate terminals of the source followers may be coupled to output terminals of the amplifier circuit. The feedback paths may be coupled prior to the coupling capacitors at inputs of the amplifier circuit. Voltages may be level shifted prior to the coupling capacitors to ensure stable bias conditions for the amplifier circuit. The amplifier circuit may be integrated in a CMOS photonics chip with the source followers comprising CMOS transistors. The amplifier circuit may receive current-mode logic or voltage signals. The electrical signals may be received from a photodetector, which may comprise a silicon germanium photodiode differentially coupled to the amplifier circuit. Optical signals for the photodetector in the chip may be received via optical fibers.

Abstract translation: 公开了一种具有次40khz低频截止的反馈放大器的系统，并且可以包括利用具有包括源跟随器和反馈电阻器的反馈路径的放大器放大经由耦合电容器接收的电信号。 源极跟随器的栅极端子可以耦合到放大器电路的输出端子。 反馈路径可以在放大器电路的输入端处的耦合电容器之前被耦合。 在耦合电容器之前，电压可能会发生电平偏移，以确保放大器电路的稳定偏置条件。 放大器电路可以集成在具有CMOS晶体管的源极跟随器的CMOS光子芯片中。 放大器电路可以接收电流模式逻辑或电压信号。 电信号可以从光电检测器接收，光电检测器可以包括差分耦合到放大器电路的硅锗光电二极管。 可以通过光纤接收芯片中的光电检测器的光信号。

公开(公告)号：US20160164614A1

公开(公告)日：2016-06-09

申请号：US15045216

申请日：2016-02-16

Applicant: Luxtera, Inc.

Inventor： Brian Welch

IPC: H04B10/60

CPC classification number: H04L25/061 ,  G02B6/4201 ,  G02B6/4242 ,  H04B10/501 ,  H04B10/516 ,  H04B10/564 ,  H04B10/60 ,  H04B10/693 ,  H04L25/0272

Abstract: Methods and systems for split voltage domain receiver circuits are disclosed and may comprise amplifying received electrical signals in a plurality of partial voltage domains, and combining the amplified received signals, utilizing a stacked cascode amplifier for each partial voltage domain, into a single differential signal in a single voltage domain. The stacked cascode amplifiers may comprise a feedback loop having a comparator which controls a current source in each domain. The signals may be received from a photodiode, which may be integrated in the integrated circuit. The amplified signals may be combined via stacked common source or common emitter amplifiers. The received signals via may be amplified by stacked inverters. The amplified received signals may be AC or DC coupled prior to the combining. The received electrical signals may be amplified and combined via cascode amplifiers. The voltage domains may be stacked and may be controlled by feedback loops.

Abstract translation: 公开了用于分压电压域接收器电路的方法和系统，并且可以包括放大多个部分电压域中的接收电信号，并且将放大的接收信号用于每个部分电压域的堆叠级联放大器组合成单个差分信号 单个电压域。 堆叠的共源共栅放大器可以包括具有控制每个域中的电流源的比较器的反馈回路。 信号可以从可以集成在集成电路中的光电二极管接收。 放大的信号可以通过堆叠的公共源或公共发射放大器组合。 所接收的信号通过堆叠的反相器可以被放大。 放大的接收信号可以在组合之前被AC或DC耦合。 所接收的电信号可以通过共源共栅放大器进行放大和组合。 电压域可以堆叠并且可以由反馈回路控制。

公开(公告)号：US20150037044A1

公开(公告)日：2015-02-05

申请号：US14448473

申请日：2014-07-31

Applicant: Luxtera, Inc.

Inventor： Mark Peterson ,  Brian Welch ,  Steffen Gloeckner ,  Peter DeDobbelaere ,  Michael Mack

IPC: H04B10/40

Abstract: Methods and systems for an optical coupler for photonics devices are disclosed and may include a photonics transceiver comprising a silicon photonics die, an optical source module, and a fiber connector for receiving optical fibers and including a die coupler and an optical coupling element. The die coupler may be bonded to a top surface of the photonics die and aligned above an array of grating couplers. The optical coupling element may be attached to the die coupler and the electronics die and the source module may be bonded to the top surface of the photonics die. A continuous wave (CW) optical signal may be received in the photonics die from the optical source module. Modulated optical signals may be received in the photonics die from optical fibers coupled to the fiber connector.

Abstract translation: 公开了用于光子器件的光耦合器的方法和系统，并且可以包括光子收发​​器，其包括硅光子管芯，光源模块和用于接收光纤并包括管芯耦合器和光耦合元件的光纤连接器。 管芯耦合器可以结合到光子管芯的顶表面并且在光栅耦合器的阵列上方对齐。 光耦合元件可以附接到管芯耦合器，并且电子管芯和源模块可以结合到光子管芯的顶表面。 可以在光源模块中从光源模块接收连续波（CW）光信号。 可以在耦合到光纤连接器的光纤的光子管芯中接收调制的光信号。

公开(公告)号：US10606003B2

公开(公告)日：2020-03-31

申请号：US14448473

申请日：2014-07-31

Applicant: Luxtera, Inc.

Inventor： Mark Peterson ,  Brian Welch ,  Steffen Gloeckner ,  Peter DeDobbelaere ,  Michael Mack

IPC: G02B6/43 ,  G02B6/42

Abstract: Methods and systems for an optical coupler for photonics devices are disclosed and may include a photonics transceiver comprising a silicon photonics die, an optical source module, and a fiber connector for receiving optical fibers and including a die coupler and an optical coupling element. The die coupler may be bonded to a top surface of the photonics die and aligned above an array of grating couplers. The optical coupling element may be attached to the die coupler and the electronics die and the source module may be bonded to the top surface of the photonics die. A continuous wave (CW) optical signal may be received in the photonics die from the optical source module. Modulated optical signals may be received in the photonics die from optical fibers coupled to the fiber connector.

公开(公告)号：US20200036449A1

公开(公告)日：2020-01-30

申请号：US16580813

申请日：2019-09-24

Applicant: Luxtera, Inc.

Inventor： Brian Welch ,  Xuelin Xu

IPC: H04B10/516 ,  H04B10/524 ,  H04B10/50 ,  H04B10/54

Abstract: Methods and systems for a distributed optical transmitter with local domain splitting is disclosed and may include, in an optical modulator integrated in a silicon photonics chip: receiving electrical signals, communicating the electrical signals to domain splitters along a length of waveguides of the optical modulator utilizing one or more delay lines, and generating electrical signals in voltage domains utilizing the domain splitters for modulating the optical signals in the waveguides of the optical modulator by driving diodes with the electrical signals generated in the voltage domains. The delay lines may comprise one delay element per domain splitter, or may comprise a delay element per domain splitter for a first subset of the domain splitters and more than one delay element per domain splitter for a second subset of the domain splitters.

公开(公告)号：US10523477B2

公开(公告)日：2019-12-31

申请号：US16379219

申请日：2019-04-09

Applicant: Luxtera, Inc.

Inventor： Brian Welch

IPC: H04B10/00 ,  H04L25/06 ,  H04B10/60 ,  H04L25/02 ,  H04B10/50 ,  H04B10/516 ,  H04B10/564 ,  H04B10/69 ,  H04J14/00 ,  G02B6/42

Abstract: Methods and systems for split voltage domain receiver circuits are disclosed and may include amplifying complementary received signals in a plurality of partial voltage domains. The signals may be combined into a single differential signal in a single voltage domain. Each of the partial voltage domains may be offset by a DC voltage from the other partial voltage domains. The sum of the partial domains may be equal to a supply voltage of the integrated circuit. The complementary signals may be received from a photodiode. The amplified received signals may be amplified via stacked common source amplifiers, common emitter amplifiers, or stacked inverters. The amplified received signals may be DC coupled prior to combining. The complementary received signals may be amplified and combined via cascode amplifiers. The voltage domains may be stacked, and may be controlled via feedback loops. The photodetector may be integrated in the integrated circuit.

公开(公告)号：US20190356518A1

公开(公告)日：2019-11-21

申请号：US16526348

申请日：2019-07-30

Applicant: Luxtera, Inc.

Inventor： Brian Welch ,  Daniel Kucharski

IPC: H04L25/06 ,  H04B10/50 ,  H04B10/69 ,  H04B10/564 ,  H04B10/516 ,  H04B10/60 ,  H04L25/02

Abstract: Methods and systems for split voltage domain transmitter circuits may include a two-branch output stage including a plurality of CMOS transistors, with each branch of the two-branch output stage comprising two stacked CMOS inverter pairs. The two stacked CMOS inverter pairs of a given branch are configured to drive a respective load, in phase opposition to the other branch. A pre-driver circuit is configured to receive a differential modulating signal and output, to respective inputs of the two stacked CMOS inverters, two synchronous differential voltage drive signals having a swing of half the supply voltage and being DC-shifted by half of the supply voltage with respect to each other. The load may include a series of diodes that are driven in differential mode via the drive signals. An optical signal may be modulated via the diodes.